CN104364695A - Zoom lens and imaging device - Google Patents
Zoom lens and imaging device Download PDFInfo
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- CN104364695A CN104364695A CN201380030393.4A CN201380030393A CN104364695A CN 104364695 A CN104364695 A CN 104364695A CN 201380030393 A CN201380030393 A CN 201380030393A CN 104364695 A CN104364695 A CN 104364695A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145129—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+++
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
[Problem] To produce a zoom lens in which compactness has been maintained while increasing the magnification to 100X or more and widening the angle. [Solution] This zoom lens comprises, in order from the object side, a positive first lens group (G1) that is fixed when varying the magnification, a negative second lens group (G2) that moves from the object side to the image side when varying the magnification, a positive third lens group (G3) that moves when varying the magnification, a positive fourth lens group (G4) that moves from the image side to the object side when varying the magnification, and a positive fifth lens group (G5) that is fixed when varying the magnification. This zoom lens employs a floating method whereby the third lens group (G3) and the fourth lens group (G4) move relative to one another when varying the magnification. The imaging magnifications of a combined lens group, comprising the third and fourth lens groups, and the second lens group (G2) each pass the -1X point simultaneously when varying the magnification from wide angle to telephoto. If the focal length at the wide angle end is defined as fw, and the largest and smallest values of the distance between the third lens group (G3) and fourth lens group (G4) when varying the magnification are defined as Dg34max and Dg34min, the following conditional equation (1) is satisfied. (Dg34max-Dg34min)/fw>2.5 ... (1)
Description
Technical field
The present invention relates to zoom lens and camera head, in more detail, relate to the powerful zoom lens being applicable to carrying on television camera and video camera etc. and the camera head possessing these zoom lens.
Background technology
Always, as the zoom lens that television camera and video camera etc. carry, there will be a known (with reference to patent documentation 1,2) that the group in order to high performance movement when zoom is formed by 3 groups.In addition, as the powerful zoom lens of zoom ratio more than 100 times, (with reference to patent documentation 3,4) that the group that there will be a known movement during zoom is formed by 2 groups.
[look-ahead technique document]
[patent documentation]
[patent documentation 1]
Unexamined Patent 7-248449 publication
[patent documentation 2]
JP 2009-128491 publication
[patent documentation 3]
JP 2010-91788 publication
[patent documentation 4]
JP 2011-39399 publication
[summary of invention]
[inventing the problem that will solve]
If make zoom lens high magnification, then the amount of movement of lens group that zoom is brought increases, therefore the most elongated by the distance of the lens of object side to being in from diaphragm.Accordingly, reach wide angle if want, then lens combination becomes large, and the weight of lens combination becomes large, therefore wide angle difficulty.In zoom lens such as described in above-mentioned patent documentation 1 ~ 4, the field angle of wide-angle side, all below 65 degree, can not reach wide angle.
On the other hand, in order to reach wide angle, if make the most complicated by the formation of the lens group of image side, then the weight of lens combination becomes large, therefore high magnificationization difficulty.Such as, in the zoom lens described in above-mentioned patent documentation 2, although can reach wide angle, zoom ratio is also less large.
Summary of the invention
The present invention is formed in view of the foregoing, its object is to, and provides a kind of and not only can maintain compactedness, but also can realize the high magnification of more than 100 times and the powerful zoom lens of wide angle and be equipped with the camera head of these zoom lens.
[for solving the means of problem]
Zoom lens of the present invention, is characterized in that, are made up of successively from object side following lens group:
That fix during zoom and there is the 1st lens group of positive light coke;
During from wide-angle side to the zoom of telescope end, from object side to image side movement and there is the 2nd lens group of negative power;
During zoom movement and there is the 3rd lens group of positive light coke;
During from wide-angle side to the zoom of telescope end, from image side to object side movement and there is the 4th lens group of positive light coke; With
It is that fix during zoom and there is the 5th lens group of positive light coke,
3rd lens group and the 4th lens group relatively move when zoom,
During from wide-angle side to the zoom of telescope end, the compound lens group of synthesis the 3rd lens group and the 4th lens group and the 2nd lens group are the point of-1 times by respective imaging multiplying power simultaneously,
Meet following conditional (1).
(Dg34max-Dg34min)/fw＞2.5 ...(1)
Wherein,
Fw: the focal length of wide-angle side
Dg34max: the maximal value at the 3rd lens group during zoom and the interval of the 4th lens group
Dg34min: the minimum value at the 3rd lens group during zoom and the interval of the 4th lens group
Zoom lens of the present invention; be made up of 5 lens groups; but except 5 lens groups, the situation that the mechanism part that also can comprise the optical element, lens flange, lens barrel, imaging apparatus, hand shaking correcting mechanism etc. beyond the lens having lens, diaphragm and the cover glass etc. that do not possess in fact focal power is graded.
In addition, so-called lens group, may not be only made up of multiple lens, also comprises only being made up of 1 piece of lens.
In addition, in the present invention, the face shape of the lens that convex surface, concave surface, plane, concave-concave, bent moon, biconvex, plano-convex and plano-concave etc. are such, the symbol of the power of lens that positive and negative is such, comprising in aspheric situation, unless otherwise indicated, otherwise all think near axis area.In addition, in the present invention, the symbol of radius-of-curvature, being just when face shape is and makes convex surface facing object side, is make to be negative when image side.
Further, in zoom lens of the present invention, preferably meet following conditional (1-1).
(Dg34max-Dg34min)/fw＞3.0 ...(1-1)
In addition, in zoom lens of the present invention, preferably meet following conditional (2).
(Dg34max-Dg34min)/f3＞0.10 ...(2)
The focal length of the f3: the 3 lens group
Dg34max: the maximal value at the 3rd lens group during zoom and the interval of the 4th lens group
Dg34min: the minimum value at the 3rd lens group during zoom and the interval of the 4th lens group
Further, following conditional (2-1) is preferably met.
(Dg34max-Dg34min)/f3＞0.15 ...(2)
In addition, in zoom lens of the present invention, the position that preferably interval of the 3rd lens group and the 4th lens group is maximum is that the point of-1 times is more by wide-angle side than the imaging multiplying power of compound lens group during zoom.
In addition, in zoom lens of the present invention, preferably minimum at the interval of telescope end the 3rd lens group and the 4th lens group.
In addition, in zoom lens of the present invention, at least 1 face preferably forming the lens of the 3rd lens group is aspheric surface.
In addition, in zoom lens of the present invention, among the formation lens of preferred the 4th lens group is non-spherical lens by the lens of image side.
In addition, in zoom lens of the present invention, preferably the 1st lens group from object side successively by: the 1st lens with negative power, the 2nd lens with positive light coke, have positive light coke the 3rd lens, have positive light coke the 4th lens and the 5th lens with positive meniscus lens shape convex surface facing object side are formed.
In addition, in zoom lens of the present invention, among the formation lens of preferred the 2nd lens group, by the lens of object side, there is negative power.
In addition, in zoom lens of the present invention, preferably the 3rd lens group is made up of 1 piece of lens with positive light coke.
In addition, in zoom lens of the present invention, preferably the 4th lens group is made up of the lens with positive light coke of more than 3 pieces and the lens with negative power of more than 1 piece.
In addition, in zoom lens of the present invention, among the formation lens of preferred the 2nd lens group is aspheric surface by the face of the object side of the lens of object side.
Camera head of the present invention, is characterized in that, is equipped with the zoom lens of the invention described above.
[effect of invention]
According to the present invention, in the zoom lens formed by 5 groups, because the suitably formation of each lens group of setting, particularly when zoom, relative to the 2nd lens group worked in zoom, correct the image planes variation come with zoom with the 3rd lens group and the 4th lens group, adopt the so-called ralocatable mode of with making the 3rd lens group and the 4th lens group relativity movement, so the variation of image planes when can correct zoom, and the suppression of the variation of spherical aberration when can carry out zoom well and coma aberration.In addition, during from wide-angle side to the zoom of telescope end because make the compound lens group of synthesis the 3rd lens group and the 4th lens group, be the point of-1 times by respective imaging multiplying power with the 2nd lens group, although so small-sized simultaneously, still can suppress the variation of aberration well, reach high magnification zoom.In addition, because the formula that satisfies condition (1), so the ray height of wide-angle side can be suppressed to uprise, wide angle is realized.
According to camera head of the present invention, because carry zoom lens of the present invention, although so be high magnification, also high definition image quality can be maintained, while reach wide angle.
Accompanying drawing explanation
Fig. 1 is the sectional view that the lens of the zoom lens representing embodiments of the invention 1 are formed
Fig. 2 is the sectional view that the lens of the zoom lens representing embodiments of the invention 2 are formed
Fig. 3 is the sectional view that the lens of the zoom lens representing embodiments of the invention 3 are formed
Fig. 4 is the figure of the relation at the zoom ratio of the zoom lens representing embodiments of the invention 1 and the interval of the 3rd lens group and the 4th lens group
Fig. 5 is the figure of the relation at the zoom ratio of the zoom lens representing embodiments of the invention 2 and the interval of the 3rd lens group and the 4th lens group
Fig. 6 is the figure of the relation at the zoom ratio of the zoom lens representing embodiments of the invention 3 and the interval of the 3rd lens group and the 4th lens group
Fig. 7 is the sectional view of the 1st lens group of the zoom lens representing embodiments of the invention 1 and the detailed formation of the 2nd lens group
Fig. 8 is the sectional view of the 3rd lens group of the zoom lens representing embodiments of the invention 1 and the detailed formation of the 4th lens group
Fig. 9 is the sectional view of the detailed formation from the 5th lens group to imaging surface of the zoom lens representing embodiments of the invention 1
Figure 10 is the sectional view of the 1st lens group of the zoom lens representing embodiments of the invention 2 and the detailed formation of the 2nd lens group
Figure 11 is the sectional view of the 3rd lens group of the zoom lens representing embodiments of the invention 2 and the detailed formation of the 4th lens group
Figure 12 is the sectional view of the detailed formation from the 5th lens group to imaging surface of the zoom lens representing embodiments of the invention 2
Figure 13 is the sectional view of the 1st lens group of the zoom lens representing embodiments of the invention 3 and the detailed formation of the 2nd lens group
Figure 14 is the sectional view of the 3rd lens group of the zoom lens representing embodiments of the invention 3 and the detailed formation of the 4th lens group
Figure 15 is the sectional view of the detailed formation from the 5th lens group to imaging surface of the zoom lens representing embodiments of the invention 3
Figure 16 is all aberration diagrams (wide-angle side) of the zoom lens of embodiments of the invention 1
Figure 17 is the coma aberration figure (wide-angle side) of the zoom lens of embodiments of the invention 1
Figure 18 is all aberration diagrams (intermediate field) of the zoom lens of embodiments of the invention 1
Figure 19 is the coma aberration figure (intermediate field) of the zoom lens of embodiments of the invention 1
Figure 20 is all aberration diagrams (telescope end) of the zoom lens of embodiments of the invention 1
Figure 21 is the coma aberration figure (telescope end) of the zoom lens of embodiments of the invention 1
Figure 22 is all aberration diagrams (wide-angle side) of the zoom lens of embodiments of the invention 2
Figure 23 is the coma aberration figure (wide-angle side) of the zoom lens of embodiments of the invention 2
Figure 24 is all aberration diagrams (intermediate field) of the zoom lens of embodiments of the invention 2
Figure 25 is the coma aberration figure (intermediate field) of the zoom lens of embodiments of the invention 2
Figure 26 is all aberration diagrams (telescope end) of the zoom lens of embodiments of the invention 2
Figure 27 is the coma aberration figure (telescope end) of the zoom lens of embodiments of the invention 2
Figure 28 is all aberration diagrams (wide-angle side) of the zoom lens of embodiments of the invention 3
Figure 29 is the coma aberration figure (wide-angle side) of the zoom lens of embodiments of the invention 3
Figure 30 is all aberration diagrams (intermediate field) of the zoom lens of embodiments of the invention 3
Figure 31 is the coma aberration figure (intermediate field) of the zoom lens of embodiments of the invention 3
Figure 32 is all aberration diagrams (telescope end) of the zoom lens of embodiments of the invention 3
Figure 33 is the coma aberration figure (telescope end) of the zoom lens of embodiments of the invention 3
Figure 34 is the stereographic map of the camera head of embodiments of the present invention
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are illustrated in detail.Fig. 1 (A), (B), (C) are the sectional views of the formation of the zoom lens representing an embodiment of the invention, and the lens of corresponding embodiment 1 described later are formed.Also have, the corresponding optical system configurations in wide-angle side (shortest focal length state) of Fig. 1 (A), the corresponding optical system configurations in intermediate field (middle focal length state) of Fig. 1 (B), the corresponding optical system configurations in telescope end (longest focal length state) of Fig. 1 (C).Equally, the configuration example of the corresponding to the lens of embodiment 2,3 described later are formed the 2nd and the 3rd, illustrates in Fig. 2 (A), (B), (C) and Fig. 3 (A), (B), (C).
Fig. 1 ~ Fig. 3 is all left side is object side, and right side is image side, the motion track of each moving lens group during from wide-angle side to telescope end zoom, and only in Fig. 1 (A), medelling ground is represented by arrow.Arrow shown in Fig. 1 (A) is corresponding with the motion track of the 2nd lens group, the 3rd lens group and the 4th lens group successively from object side.Further, in the configuration example of the 2nd and the 3rd, the motion track of each moving lens group is substantially identical with the 1st configuration example, therefore omits the diagram of motion track in figs. 2 and 3.
The zoom lens of the embodiments of the present invention, go for such as carrying employ solid-state imager high performance television camera and video camera etc. on, suitable examples as zoom ratio be more than 100 times from standard to the scope in territory of looking in the distance.
These zoom lens, possess following lens group along optical axis Z successively from object side: the 1st lens group G1 with positive light coke fixed during zoom; During from wide-angle side to the zoom of telescope end, the 2nd lens group G2 with negative power from object side to image side movement; The 3rd lens group G3 with positive light coke of movement during zoom; During from wide-angle side to the zoom of telescope end, from image side to the 4th lens group G4 with positive light coke of object side movement; Containing aperture diaphragm St, the 5th lens group G5 with positive light coke fixed during zoom.Further, the aperture diaphragm St shown in each figure, not necessarily represents its size and shape, and represents its position on optical axis Z.
At imaging surface (imaging surface) Sim of these zoom lens, be configured with such as not shown imaging apparatus.Between the 5th lens group G5 and imaging surface, according to the formation of the camera side of assembling camera lens, also can be configured with various optical component.In illustrated configuration example, be configured with the color separation optical system GC be made up of colour splitting prism etc.
2nd lens group G2, the 3rd lens group G3 and the 4th lens group G4, movable during zoom, there is the function as zoom group.In the zoom lens of present embodiment, there is the structure of so-called interior zoom mode, be not namely make optical system front end, but make the group of optical system inside move and carry out zoom.Among television camera and video camera etc., the method for so interior zoom mode, overall length during zoom and weight balancing with low uncertainty, operability is excellent, thinks preferred.
Among zoom group, the 2nd lens group G2, has the function as variation group, and the 3rd lens group G3 and the 4th lens group G4 has the function as compensating group.In more detail, carry out zoom, the correction of the variation of thing followed image planes by making the 2nd lens group G2 move on optical axis, then by making, the 3rd lens group G3 and the 4th lens group G4 is mobile on optical axis to carry out.
Particularly in the zoom lens of present embodiment, employing be zoom time the 3rd lens group G3 and the 4th lens group G4 carry out the so-called ralocatable mode of the movement of relativity.According to this formation, the variation of image planes come with zoom can be corrected, and the variation of spherical aberration when can correct zoom well and coma aberration (also claiming coma), keep good optical property.
In the zoom lens of present embodiment, during from wide-angle side to the zoom of telescope end, synthesis the 3rd lens group G3 and the 4th lens group G4 compound lens group, with the 2nd lens group G2, formed in the mode of the point by respective imaging multiplying power β being-1 times simultaneously.Form accordingly, can chromatic aberation on axis calibration well, and can high magnification be reached.
In the zoom lens of present embodiment, preferably its constituted mode is, 3rd lens group G3 and the 4th lens group G4 is spaced apart maximum position, is that the point of-1 times is more by wide-angle side than the imaging multiplying power β of the compound lens group synthesizing the 3rd lens group G3 and the 4th lens group during zoom.Form accordingly, than the imaging multiplying power β of compound lens group be the point of-1 times more by wide-angle side, uprise by the light of the lens of object side is high.Therefore, the point being-1 times than the imaging multiplying power β of compound lens group more leans on wide-angle side, makes the interval of the 3rd lens group G3 and the 4th lens group G4 maximum, effectively can reach wide angle.
In the zoom lens of present embodiment, preferably its constituted mode is, makes the interval of the 3rd lens group G3 and the 4th lens group G4 minimum at telescope end.Form accordingly, because close at telescope end the 2nd lens group G2, the 3rd lens group G3 and the 4th lens group G4, so can refractive index be strengthened, can high magnification be reached thus.
Fig. 4 to Fig. 6 is the zoom ratio represented in the configuration example of the 1st to the 3rd, curve map with the relation at the interval of the 3rd lens group G3 and the 4th lens group G4.As shown in Figures 4 to 6, in the 1st to the 3rd configuration example, its constituted mode is, the interval of the 3rd lens group G3 and the 4th lens group G4 becomes maximum position, is that the point of-1 times is more by wide-angle side than the imaging multiplying power β of the compound lens group synthesizing the 3rd lens group G3 and the 4th lens group during zoom.In addition, its constituted mode is, at telescope end, being spaced apart of the 3rd lens group G3 and the 4th lens group G4 is minimum.
1st lens group G1, example such as shown in Fig. 1, can be 5 group structures, namely from object side successively, by have negative power the 1st lens, have positive light coke the 2nd lens, have positive light coke the 3rd lens, have positive light coke the 4th lens and the 5th lens with positive meniscus lens shape convex surface facing object side are formed.Form accordingly, the zoom lens of present embodiment can be made to average out from performance face and weight face.
2nd lens group G2, configuration example such as shown in Fig. 1, can be 6 pieces of structures, namely from object side successively, by have negative power the 1st lens, have negative power the 2nd lens and have positive light coke the 3rd lens balsaming lens, have positive light coke the 4th lens and there is the balsaming lens of the 5th lens of negative power and the 6th lens with negative power are formed.Make the lens of object side that lean on most of the 2nd lens group G2 become the lens with negative power, the 2nd lens group G2 of the effect had as variation group can be formed compactly, the stroke required for zoom can be guaranteed, therefore, it is possible to become to reach high magnification.
Preferably the 2nd lens group G2 has the aspheric surface at least 1 face, and this aspheric surface is at the lens with negative power leaning on most object side of the 2nd lens group G2.During zoom, the 2nd lens group G2 of movement has non-spherical lens, favourable on aberration correction, in addition, by making being positioned at of zoom group be non-spherical lens by the lens with negative power of object side, can obtain high aberration correction effect.
3rd lens group G3, such as, example shown in Fig. 1, can be made up of 1 piece of lens with positive light coke.See that the motion track of Fig. 1 is known, during from wide-angle side to telescope end zoom, the 3rd lens group G3, not necessarily moves up in the side of from image side to object side, also can move in the opposite direction.Carry out the 3rd lens group G3 of movement like this, workability is had an immense impact on.Therefore, in order to obtain good workability, preferably the 3rd lens group G3 light weight, for this reason, preferably with few lens piece number, the lens more particularly having positive light coke by 1 piece are formed.
In addition, preferably the 3rd lens group G3 at least has the aspheric surface in 1 face, forms accordingly, can more effectively by ralocatable mode correcting spherical aberration and coma aberration.
Preferably the 4th lens group, the lens having a positive light coke by least 3 pieces and at least 1 piece of lens with negative power are formed, example such as shown in Fig. 1, can form by 4 pieces of knots, namely from object side successively, by having the 1st lens of positive light coke and having the balsaming lens of the 2nd lens of negative power, and 2 pieces of the 3rd, the 4th lens with positive light coke are formed.Form accordingly, chromatic aberation on the axle that can correct telescope end well.
In addition, preferably the 4th lens group G4 at least has the aspheric surface in 1 face, and preferably this aspheric surface is the face with the object side of the lens of positive light coke leaning on image side most of the 4th lens group G4.During zoom, the 4th lens group G4 of movement has non-spherical lens, favourable on aberration correction, in addition, by making being positioned at of zoom group be non-spherical lens by the face with the object side of the lens of positive light coke of image side, high aberration correction effect can be obtained, particularly can correcting spherical aberration, coma aberration and curvature of the image well.
In addition, preferably the 4th lens group G4, at least has the aspheric surface of this shape that one side dies down along with the positive light coke from optical axis towards periphery.Form accordingly, be conducive to the variation of all aberrations when suppressing zoom.
5th lens group G5, there is the function as relaying (mainly) group, example such as shown in Fig. 1, can be 13 pieces of structures, namely from object side successively, by aperture diaphragm St, there are the 1st lens of negative power, there are the 2nd lens of positive light coke, there are the 3rd lens of negative power, there are the 4th lens of positive light coke, there are the 5th lens of negative power, there are the 6th lens of positive light coke, there are the 7th lens of negative power, there are the 8th lens of positive light coke, the balsaming lens of the 9th lens with negative power and the 10th lens with positive light coke, optical filter, and the 11st lens with positive light coke are formed with the balsaming lens of the 12nd lens with negative power.Further, the optical filter between the 10th lens and the 11st lens, the optical component that when also can be replaced as preventing over-exposed, the sharp cut-off filter of the bleeding of the short wavelength side of generation is such.
In addition, the zoom lens of present embodiment, are formed in the mode meeting following conditional (1).
(Dg34max-Dg34min)/fw＞2.5 ...(1)
Wherein,
Fw: the focal length of wide-angle side
Dg34max: the maximal value at the 3rd lens group G3 during zoom and the interval of the 4th lens group G4
Dg34min: the minimum value at the 3rd lens group G3 during zoom and the interval of the 4th lens group G4
Conditional (1) is regulation relative to wide-angle side focal length, the formula that carries out the maximal value at interval of 2 lens groups floated and the difference of the suitable of minimum value.The formula that satisfies condition (1), can suppress that the light of wide-angle side is high to be uprised, and can realize wide angle.If lower than the lower limit of conditional (1) formula, then the effect making the light on the 3rd lens group G3 shrink is insufficient, wide angle difficulty.
In order to improve above-mentioned action effect, more preferably meet following conditional (1-1).
(Dg34max-Dg34min)/fw＞3.0 ...(1-1)
In addition, the zoom lens of present embodiment, preferably meet following conditional (2).
(Dg34max-Dg34min)/f3＞0.10 ...(2)
Wherein,
The focal length of the f3: the 3 lens group G3
Dg34max: the maximal value at the 3rd lens group G3 during zoom and the interval of the 4th lens group G4
Dg34min: the minimum value at the 3rd lens group G3 during zoom and the interval of the 4th lens group G4
Conditional (2) is regulation relative to the 3rd lens group G3 focal length, the formula that carries out the maximal value at interval of 2 lens groups floated and the difference of the suitable of minimum value.If lower than the lower limit of conditional (2), then the effect making the light on the 3rd lens group G3 shrink is insufficient, wide angle difficulty.
In order to improve above-mentioned action effect, more preferably meet following conditional (2-1).
(Dg34max-Dg34min)/f3＞0.15 ...(2-1)
As described above, zoom lens according to the present embodiment, be that 5 group structures become on the whole, the formation of each lens group of suitable setting, particularly when zoom, for the 2nd lens group G2 acting on zoom, the image planes variation come with zoom is corrected with the 3rd lens group G3 and the 4th lens group G4, adopt the so-called ralocatable mode making the 3rd lens group G3 and the 4th lens group G4 relatively movement, the variation of image planes when therefore can correct zoom, and the suppression of the variation of spherical aberration when can carry out zoom well and coma aberration.In addition, because during from wide-angle side to the zoom of telescope end, make the compound lens group of synthesis the 3rd lens group G3 and the 4th lens group G4, be the point of-1 times simultaneously by respective imaging multiplying power β with the 2nd lens group G2, although so small-sized, but still the variation of aberration can be suppressed well, reach high magnification zoom.In addition, because the formula that satisfies condition (1), so the ray height of wide-angle side can be suppressed to uprise, realize wide-angle and high performance high power zoom lens system.
[embodiment]
Next, the concrete numerical example for the zoom lens of present embodiment is described.
[embodiment 1]
The lens profile of embodiment 1 illustrates in FIG, and its detailed formation illustrates in Fig. 7 ~ Fig. 9.Fig. 7 represents the detailed formation of the 1st lens group G1 and the 2nd lens group G2, and Fig. 8 represents the detailed formation of the 3rd lens group G3 and the 4th lens group G4, and Fig. 9 represents the detailed formation from the 5th lens group G5 to imaging surface Sim.
In embodiment 1,1st lens group G1 is 5 pieces of structures of lens L1 ~ L5,2nd lens group G2 is 6 pieces of structures of lens L21 ~ L26,3rd lens group G3 is 1 piece of structure of lens L31,4th lens group is 4 pieces of structures of lens L41 ~ L44, and the 5th lens group G5 is 13 pieces of structures of aperture diaphragm St and lens L51 ~ L63.
The lens data of the zoom lens of embodiment 1 illustrates in Table 1, and other data illustrate that in table 2, asphericity coefficient illustrates in table 3.Further, the meaning of the mark in following table 1 ~ table 3 in embodiment described later too.In addition, in following table, describe the numerical value after rounding by the figure place of regulation.In addition, in the data of the table of following description, as the unit usage degree of angle, the unit as length uses mm, but because optical system can scale up or scaled use, so also can use other suitable units.
In the lens data of table 1, Si represent using by the face of the inscape of object side as No. 1 the face numbering along with No. i-th that increases successively towards image side (i=1,2,3 ...), Ri represents the radius-of-curvature in No. i-th face, and Di represents the interval, face on optical axis Z in No. i-th face and the i-th+No. 1 face.In addition, ndj represent using by the lens of object side as No. 1 the refractive index to d line (wavelength 587.6nm) along with the optical element of the jth that increases successively towards image side number (j=1,2,3 ...), ν dj represents the Abbe number to d line of jth optical element, and θ g, fj represent the part dispersion ratio of jth optical element.Further, in lens data, also comprise aperture diaphragm St, color separation optical system GC illustrates interior.The radius-of-curvature of lens data when convex to object side be just, convex to image side time be negative.In addition, Ri, Di of the symbol of Ri, Di and Fig. 7 ~ Fig. 9 of table 1 are corresponding.
In the lens data of table 1, variable description respectively in hurdle, is DD [10], DD [20], DD [22], DD [29] by the suitable face interval D 10 in the interval of interval that interval changes in order to carry out zoom, the 1st lens group G1 and the 2nd lens group G2, the 2nd lens group G2 and the 3rd lens group G3, the interval of the 3rd lens group G3 and the 4th lens group G4, D20, D22, D29 mono-.Further, the Dg34 corresponding surface interval D 22 of conditional (1), (2).
In table 2, as other data, the value about the zoom ratio of the complete set under the infinity focus state of wide-angle side, intermediate field and telescope end, paraxial focal distance f ' (mm), rear cut-off distance (air converts long) Bf ', F value (FNo.) and field angle (2 ω) is also shown.In addition in table 2, as face interval D 10, D20, D22, data DD [10], DD [20], DD [22], DD [29] during the zoom of D29, represent the zoom interval (mm) under the infinity focus state of wide-angle side, intermediate field and telescope end.
In the lens data of table 1, be attached to the mark " * " in the left side of face numbering, represent that this lens face is aspherical shape.In the basic lens data of table 1, as these aspheric radius-of-curvature, represent the numerical value of paraxial radius-of-curvature.
In addition in table 3, the asphericity coefficient of the zoom lens of embodiment 1 is shown.At this, illustrate aspheric numbering and about this aspheric asphericity coefficient.At this, " E-n " (n: integer) of the numerical value of asphericity coefficient is meant to " × 10
-n".Also having asphericity coefficient, is the value of each COEFFICIENT K A in following aspheric surface formula, Am.
Zd＝C·h
2/{1+(1-KA·C
2·h
2)
1/2}+∑Am·h
m
Wherein,
Zd: the aspheric surface degree of depth (hanging down into the length of the vertical line of the tangent plane vertical with optical axis in aspheric surface summit from the point the aspheric surface of height h)
H: highly (from optical axis to the distance of lens face)
C: the inverse of paraxial radius-of-curvature
KA, Am: asphericity coefficient
The aspheric surface of the zoom lens of embodiment 1, based on above-mentioned aspheric surface formula, about asphericity coefficient Am, effectively uses the number of times of A3 ~ A16 to represent.
[table 1]
Embodiment 1 lens data
[table 2]
Other data of embodiment 1
| Wide-angle | Middle | Look in the distance | |
| Zoom ratio | 1.0 | 3.6 | 110.0 |
| f | 8.55 | 20.09 | 940.19 |
| Bf | 47.39 | 47.39 | 47.39 |
| FNo. | 1.76 | 1.76 | 5.02 |
| 2ω[°] | 70.0 | 29.6 | 0.6 |
| DD[10] | 1.87 | 75.90 | 211.23 |
| DD[20] | 298.66 | 194.76 | 4.52 |
| DD[22] | 19.49 | 39.54 | 2.60 |
| DD[29] | 3.05 | 12.87 | 104.72 |
[table 3]
Embodiment 1 aspheric surface
| Face is numbered | 11 | 21 | 29 |
| KA | -1.0560673E+07 | -2.5646895E+00 | -1.2102030E+02 |
| A3 | -6.5099602E-07 | -2.4140992E-07 | 9.1703639E-07 |
| A4 | 8.9671558E-07 | -2.3544528E-08 | -1.2356506E-08 |
| A5 | -5.5248435E-08 | 5.8498064E-09 | 5.7433545E-08 |
| A6 | -1.4133071E-09 | -7.1343769E-10 | -5.5744053E-09 |
| A7 | 5.4439812E-10 | 3.6959234E-11 | 3.3706862E-10 |
| A8 | -3.1254541E-11 | -6.3445247E-13 | -1.0113154E-11 |
| A9 | 4.3046715E-13 | -2.8840871E-15 | 5.7897335E-14 |
| A10 | 2.6343602E-15 | -5.1813755E-16 | 4.4708227E-15 |
| A11 | 9.0135622E-16 | 3.1801800E-17 | -1.1548774E-16 |
| A12 | -4.6125007E-17 | 2.1482522E-20 | 2.8521722E-18 |
| A13 | 7.1632537E-19 | -2.1216030E-20 | -1.3847062E-19 |
| A14 | -2.5129412E-20 | 1.2922165E-22 | 3.7281660E-21 |
| A15 | 1.1132105E-21 | 6.7146617E-24 | -4.3743445E-23 |
| A16 | -1.4831401E-23 | -8.1823600E-26 | 1.7703554E-25 |
[embodiment 2]
The lens profile of embodiment 2 illustrates in fig. 2, and its detailed formation illustrates in Figure 10 ~ Figure 12.Figure 10 represents the detailed formation of the 1st lens group G1 and the 2nd lens group G2, and Figure 11 represents the detailed formation of the 3rd lens group G3 and the 4th lens group G4, and Figure 12 represents the detailed formation from the 5th lens group G5 to imaging surface Sim.
In example 2,1st lens group G1 is 5 pieces of structures of lens L1 ~ L5,2nd lens group G2 is 6 pieces of structures of lens L21 ~ L26,3rd lens group G3 is 1 piece of structure of lens L31,4th lens group is 4 pieces of structures of lens L41 ~ L44, and the 5th lens group G5 is 12 pieces of structures of aperture diaphragm St and lens L51 ~ L62.
The lens data of the zoom lens of embodiment 2 illustrates at table 4, and other data illustrate that in table 5, asphericity coefficient illustrates in table 6.
[table 4]
Embodiment 2 lens data
[table 5]
Other data of embodiment 2
| Wide-angle | Middle | Look in the distance | |
| Zoom ratio | 1.0 | 3.6 | 110.0 |
| f′ | 8.57 | 20.13 | 942.15 |
| Bf′ | 47.85 | 47.85 | 47.85 |
| FNo. | 1.76 | 1.76 | 4.97 |
| 2ω[°] | 69.0 | 29.4 | 0.6 |
| DD[10] | 1.75 | 66.14 | 202.59 |
| DD[20] | 270.99 | 158.22 | 3.93 |
| DD[22] | 37.80 | 72.45 | 1.46 |
| DD[29] | 1.70 | 15.43 | 104.27 |
[table 6]
Embodiment 2 aspheric surface
| Face is numbered | 19 | 21 | 29 |
| KA | 9.6256750E-01 | 4.4555256E+00 | -6.7189484E+00 |
| A3 | 4.7874714E-07 | -9.4296108E-07 | 6.4891351E-07 |
| A4 | -2.1717313E-07 | 1.0852951E-07 | -1.0300575E-08 |
| A5 | 7.9128387E-08 | -9.9003499E-09 | 8.3889243E-08 |
| A6 | -1.1603798E-08 | -3.2279132E-11 | -8.9270179E-09 |
| A7 | 1.1960309E-09 | 4.1682651E-11 | 5.6004986E-10 |
| A8 | -1.1263495E-10 | -1.7932094E-12 | -1.8965248E-11 |
| A9 | 9.6028727E-12 | 2.8696284E-15 | 2.2201939E-13 |
| A10 | -4.4629994E-13 | 1.0574058E-15 | 1.3708120E-15 |
| A11 | -3.0563472E-15 | -1.0095930E-18 | 3.7993244E-16 |
| A12 | 1.1632920E-15 | -4.3686656E-19 | -3.2919620E-17 |
| A13 | -3.5265160E-17 | -6.1245204E-21 | 1.1277010E-18 |
| A14 | 3.7349174E-20 | 1.3075634E-22 | -2.1182469E-20 |
| A15 | 4.6831771E-21 | 6.1205335E-24 | 2.2216553E-22 |
| A16 | 1.2465624E-22 | -1.0001129E-25 | -1.0417475E-24 |
[embodiment 3]
The lens profile of embodiment 3 illustrates in figure 3, and its detailed formation illustrates in Figure 13 ~ Figure 15.Figure 13 is the detailed formation of the 1st lens group G1 and the 2nd lens group G2, and Figure 14 is the detailed formation of the 3rd lens group G3 and the 4th lens group G4, and Figure 15 is the detailed formation from the 5th lens group G5 to imaging surface Sim.
In embodiment 3,1st lens group G1 is 5 pieces of structures of lens L1 ~ L5,2nd lens group G2 is 6 pieces of structures of lens L21 ~ L26,3rd lens group G3 is 1 piece of structure of lens L31,4th lens group is 4 pieces of structures of lens L41 ~ L44, and the 5th lens group G5 is 13 pieces of structures of aperture diaphragm St and lens L51 ~ L63.
The face data of the zoom lens of embodiment 3 illustrate in table 7, and other data illustrate that in table 8, asphericity coefficient illustrates in table 9.
[table 7]
Embodiment 3 lens data
[table 8]
Other data of embodiment 3
| Wide-angle | Middle | Look in the distance | |
| Zoom ratio | 1.0 | 3.5 | 103.0 |
| f′ | 8.52 | 19.78 | 877.32 |
| Bf′ | 48.45 | 48.45 | 48.45 |
| FNo. | 1.76 | 1.76 | 4.59 |
| 2ω[°] | 69.6 | 30.0 | 0.8 |
| DD[10] | 1.83 | 68.39 | 197.28 |
| DD[20] | 299.70 | 198.05 | 2.06 |
| DD[22] | 3.16 | 28.68 | 1.04 |
| DD[29] | 3.02 | 12.61 | 107.34 |
[table 9]
Embodiment 3 aspheric surface
| Face is numbered | 11 | 21 | 29 |
| KA | -2.8085771E+07 | -2.9662887E+00 | -2.3581504E+02 |
| A3 | -1.3375542E-06 | -1.3193425E-06 | -1.5899746E-06 |
| A4 | -1.2777185E-07 | -8.0284404E-08 | -2.8400273E-07 |
| A5 | 8.3387849E-08 | 1.7166267E-08 | 7.6188282E-08 |
| A6 | -5.8228695E-09 | -1.1586681E-09 | -6.4041905E-09 |
| A7 | 3.8723993E-10 | 1.5739909E-11 | 3.0694404E-10 |
| A8 | -4.9876871E-11 | 1.3013656E-12 | -8.4592142E-12 |
| A9 | 3.5365431E-12 | -6.9180995E-14 | 1.4978477E-13 |
| A10 | -3.6996363E-14 | 2.0739819E-15 | -2.0621754E-15 |
| A11 | -6.0224988E-15 | -5.8848365E-17 | 1.2772896E-17 |
| A12 | 1.1373820E-16 | 5.6046411E-19 | 1.0050880E-18 |
| A13 | 1.1235964E-17 | 4.0134982E-20 | -7.1943407E-20 |
| A14 | -5.1439336E-19 | -1.5399791E-21 | 2.6096353E-21 |
| A15 | 6.9310481E-21 | 2.0818993E-23 | -4.7404073E-23 |
| A16 | -1.6847737E-23 | -9.9835662E-26 | 3.3165061E-25 |
[other numeric data of each embodiment]
The value that the zoom lens of embodiment 1 ~ 3 shown in table 10 and conditional (1), (2) are corresponding.As shown in Table 10, embodiment 1 ~ 3 all satisfies condition formula (1), (2).
[table 10]
[aberration performance]
Figure 16 (A) ~ (D) represents the aberration diagram of the spherical aberration in wide-angle side under the infinity focus state of the zoom lens of embodiment 1, astigmatism, distortion and multiplying power chromatic aberation respectively, and Figure 17 (A) ~ (G) represents coma aberration figure.Figure 18 (A) ~ (D) represents the aberration diagram of the spherical aberration at intermediate field under the infinity focus state of the zoom lens of embodiment 1, astigmatism, distortion and multiplying power chromatic aberation respectively, and Figure 19 (A) ~ (G) represents coma aberration figure.Figure 20 (A) ~ (D) represents the aberration diagram of the spherical aberration at telescope end under the infinity focus state of the zoom lens of embodiment 1, astigmatism, distortion and multiplying power chromatic aberation respectively, and Figure 21 (A) ~ (G) represents coma aberration figure.Further, in coma aberration, (A) ~ (D) of each figure represents the coma aberration of the meridian direction under each angle of half field-of view, and (E) ~ (G) represents the coma aberration in the sagitta of arc direction under each angle of half field-of view.
In each aberration diagram, the aberration that to illustrate with d line (587.6nm) be reference wavelength.In spherical aberration diagram, the aberration about wavelength 656.3nm (C line) and wavelength 486.1nm (F line) is also shown.In astigmatism figure, solid line represents sagitta of arc direction, and dotted line represents the aberration of meridian direction.In multiplying power chromatic aberation figure, the aberration about C line and F line is shown.In addition, as the unit of the scale of the longitudinal axis of coma aberration figure, use mm at this, but in accompanying drawing, omit its description.About the aberration of d line shown in coma aberration figure.FNo. represent F value, ω represents angle of half field-of view.
Equally, about illustrating that, in Figure 22 (A) ~ (D), coma aberration illustrates at Figure 23 (A) ~ (G) at all aberration diagrams of wide-angle side under the infinity focus state of the zoom lens of embodiment 2.About illustrating that, at Figure 24 (A) ~ (D), coma aberration illustrates in Figure 25 (A) ~ (G) at all aberration diagrams of intermediate field under the infinity focus state of the zoom lens of embodiment 2.About illustrating that, in Figure 26 (A) ~ (D), coma aberration illustrates in Figure 27 (A) ~ (G) at all aberration diagrams of telescope end under the infinity focus state of the zoom lens of embodiment 2.
Equally, all aberration diagrams about the wide-angle side under the infinity focus state of the zoom lens of embodiment 3 illustrate that, in Figure 28 (A) ~ (D), coma aberration illustrates in Figure 29 (A) ~ (G).About illustrating that, at Figure 30 (A) ~ (D), coma aberration illustrates in Figure 31 (A) ~ (G) at all aberration diagrams of intermediate field under the infinity focus state of the zoom lens of embodiment 3.About illustrating that, in Figure 32 (A) ~ (D), coma aberration illustrates in Figure 33 (A) ~ (G) at all aberration diagrams of telescope end under the infinity focus state of the zoom lens of embodiment 3.
From above each numeric data and each aberration diagram, the zoom lens of embodiment 1 ~ 3, both can realize miniaturization, had again the high zoom ratio of more than 100 times, and the F value of wide-angle side is 1.76, were bright lens combination.In addition we know, each aberration is corrected well, during zoom in addition from wide-angle side to telescope end, comprises spherical aberration, the variation of each aberration of coma aberration all suppresses very little.
(embodiment of camera head)
Next, the embodiment for camera head of the present invention is described.Figure 34 is the stereographic map of the television camera 10 of an embodiment as camera head of the present invention.Television camera 10 shown in Figure 34, is made up of lens devices 12 and camera main-body 14.Lens devices 12 possesses as follows: the zoom lens 12a of embodiments of the present invention, and shooting is by the imaging apparatus 12b of the picture of the subject of zoom lens 12a imaging.Further, in Figure 34, diagrammatically illustrate zoom lens 12a.
Television camera 10, can be supported on the The Cloud Terrace 18 on the top being arranged at moving lifting base (ペ デ ス sunset Le De リ mono-) 16 movably along level (pan) direction and pitching (tilt) direction.On The Cloud Terrace 18, photographer (operator) moves handle (パ ソ rod: pan bar) 22,23 stretch out towards rear and establish with two-handed 2.Moving the end of handle 22, the zoom controller 26 be connected on lens devices 12 is being installed, is moving the end of handle 23 via cable 25, the focus controller 28 be connected on lens devices 12 via cable 27 is being installed.
On zoom controller 26, being provided with from reference position can the thumb ring (サ system リ ソ グ) 30 of Double-directional rotary.If thumb ring 30 is by photographer's rotation process, then just be provided to lens devices 12 from zoom controller 26 with the zoom instructions signal corresponding to operational ton, i.e. sense of rotation and the rotation amount of reference position since then, the zoom lens 12a of lens devices 12 is to wide-angle side or side zoom of looking in the distance.Thus, zoom is carried out by manual mode operation.
On the other hand, in the main body 32 being fixed on the focus controller 28 moved on handle 23, be provided with focusing ring (rotating operation part) 34 rotationally.If focusing ring 34 is by photographer's rotation process, be then just provided to lens devices 12 from focus controller 28 with the focus command signal corresponding to its operational ton, i.e. sense of rotation and rotation amount, the condenser lens of lens devices 12 moves to pole nearside or unlimited distally.Thus, focus and to be carried out by manual mode operation.
As above-mentioned, the zoom lens 12a of embodiments of the present invention, while pursue miniaturization, while realize wide angle and high zoom ratio, spherical aberration when can suppress zoom, the variation of coma aberration, have good optical property, therefore the television camera 10 of zoom lens 12a is equipped with, can form small-sizedly, there is the function of high zoom ratio, and imaging can go out distinct picture in the imaging surface of its imaging apparatus 12b.Therefore, although be high magnification, also high definition image quality can be maintained, while reach wide angle.
Above, mode and the embodiment of enumerating enforcement describe the present invention, but the present invention does not limit by the mode of above-mentioned enforcement and embodiment, but can carry out various distortion.Such as, the radius-of-curvature of each lens components, the value at interval, face and refractive index etc., be not defined as the value shown in above-mentioned each numerical example, can get other value yet.
In addition, in the above-described embodiment, be illustrated for television camera as camera head, but the present invention is not limited to this, such as, also goes for other the camera head such as video camera and CCTV camera.
Claims (14)
1. zoom lens, is characterized in that,
Be made up of following lens group successively from object side:
That fix during zoom and there is the 1st lens group of positive light coke;
From wide-angle side to from object side to image side movement during the zoom of telescope end and there is the 2nd lens group of negative power;
During zoom movement and there is the 3rd lens group of positive light coke;
From wide-angle side to during the zoom of telescope end from image side to object side movement and there is the 4th lens group of positive light coke; With
It is that fix during zoom and there is the 5th lens group of positive light coke,
Relatively move when described 3rd lens group and described 4th lens group zoom,
During from wide-angle side to the zoom of telescope end, synthesize the compound lens group of described 3rd lens group and described 4th lens group, be the point of-1 times simultaneously by respective imaging multiplying power with described 2nd lens group,
Meet following conditional (1),
(Dg34max-Dg34min)/fw＞2.5...(1)
Wherein,
Fw: the focal length of wide-angle side,
Dg34max: the maximal value at described 3rd lens group during zoom and the interval of described 4th lens group,
Dg34min: the minimum value at described 3rd lens group during zoom and the interval of described 4th lens group.
2. zoom lens according to claim 1, is characterized in that,
Meet following conditional (1-1),
(Dg34max-Dg34min)/fw＞3.0...(1-1)
Wherein,
Fw: the focal length of wide-angle side,
Dg34max: the maximal value at described 3rd lens group during zoom and the interval of described 4th lens group,
Dg34min: the minimum value at described 3rd lens group during zoom and the interval of described 4th lens group.
3. zoom lens according to claim 1 and 2, is characterized in that,
Meet following conditional (2),
(Dg34max-Dg34min)/f3＞0.10...(2)
F3: the focal length of described 3rd lens group,
Dg34max: the maximal value at described 3rd lens group during zoom and the interval of described 4th lens group,
Dg34min: the minimum value at described 3rd lens group during zoom and the interval of described 4th lens group.
4. zoom lens according to claim 3, is characterized in that,
Meet following conditional (2-1),
(Dg34max-Dg34min)/f3＞0.15...(2-1)
F3: the focal length of described 3rd lens group,
Dg34max: the maximal value at described 3rd lens group during zoom and the interval of described 4th lens group,
Dg34min: the minimum value at described 3rd lens group during zoom and the interval of described 4th lens group.
5. zoom lens according to any one of claim 1 to 4, is characterized in that,
Described 3rd lens group and described 4th lens group be spaced apart maximum position, be that the point of-1 times is more by wide-angle side than the imaging multiplying power of compound lens group described during zoom.
6. zoom lens according to any one of claim 1 to 5, is characterized in that,
At telescope end, the interval of described 3rd lens group and described 4th lens group is minimum.
7. zoom lens according to any one of claim 1 to 6, is characterized in that,
At least 1 face forming the lens of described 3rd lens group is aspheric surface.
8. zoom lens according to any one of claim 1 to 7, is characterized in that,
Among the formation lens of described 4th lens group is non-spherical lens by the lens of image side.
9. zoom lens according to any one of claim 1 to 8, is characterized in that,
Described 1st lens group from object side successively by: the 1st lens with negative power, the 2nd lens with positive light coke, have positive light coke the 3rd lens, have positive light coke the 4th lens and the 5th lens with positive meniscus lens shape convex surface facing object side are formed.
10. zoom lens according to any one of claim 1 to 9, is characterized in that,
The lens of object side that lean on most among the formation lens of described 2nd lens group have negative power.
11. zoom lens according to any one of claim 1 to 10, is characterized in that,
Described 3rd lens group is made up of 1 piece of lens with positive light coke.
12. zoom lens according to any one of claim 1 to 11, is characterized in that,
Described 4th lens group is made up of the lens with positive light coke of more than 3 pieces and the lens with negative power of more than 1 piece.
13. zoom lens according to any one of claim 1 to 13, is characterized in that,
Among the formation lens of described 2nd lens group is aspheric surface by the face of the object side of the lens of object side.
14. 1 kinds of camera heads, is characterized in that,
Be equipped with zoom lens according to claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-132860 | 2012-06-12 | ||
| JP2012132860 | 2012-06-12 | ||
| PCT/JP2013/003334 WO2013187000A1 (en) | 2012-06-12 | 2013-05-27 | Zoom lens and imaging device |
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| Publication Number | Publication Date |
|---|---|
| CN104364695A true CN104364695A (en) | 2015-02-18 |
| CN104364695B CN104364695B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201380030393.4A Expired - Fee Related CN104364695B (en) | 2012-06-12 | 2013-05-27 | Zoom lens and camera head |
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| Country | Link |
|---|---|
| US (1) | US9261684B2 (en) |
| JP (1) | JP5711427B2 (en) |
| CN (1) | CN104364695B (en) |
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| CN110658614A (en) * | 2018-06-29 | 2020-01-07 | 富士胶片株式会社 | Zoom lens and imaging device |
| CN114047616A (en) * | 2021-11-23 | 2022-02-15 | 中国航空工业集团公司洛阳电光设备研究所 | Medium wave infrared continuous zooming optical system with meter-level long focal length and hundred-fold variable power ratio |
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| JP2016012118A (en) * | 2014-06-06 | 2016-01-21 | 富士フイルム株式会社 | Zoom lens and image capturing device |
| JP6425238B2 (en) | 2014-07-02 | 2018-11-21 | カンタツ株式会社 | Imaging lens |
| JP6564200B2 (en) * | 2015-02-19 | 2019-08-21 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| WO2017169583A1 (en) | 2016-03-29 | 2017-10-05 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JP6723868B2 (en) * | 2016-08-09 | 2020-07-15 | キヤノン株式会社 | Zoom lens and imaging device having the same |
| JP6943265B2 (en) * | 2017-03-07 | 2021-09-29 | 株式会社ニコン | Variable magnification optical system, optical device |
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| JP5436091B2 (en) | 2009-08-17 | 2014-03-05 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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- 2013-05-27 JP JP2014520895A patent/JP5711427B2/en not_active Expired - Fee Related
- 2013-05-27 CN CN201380030393.4A patent/CN104364695B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108885332A (en) * | 2016-03-29 | 2018-11-23 | 富士胶片株式会社 | Zoom lens and photographic device |
| CN108885332B (en) * | 2016-03-29 | 2019-09-10 | 富士胶片株式会社 | Zoom lens and photographic device |
| US10746976B2 (en) | 2016-03-29 | 2020-08-18 | Fujifilm Corporation | Zoom lens and imaging apparatus |
| CN110658614A (en) * | 2018-06-29 | 2020-01-07 | 富士胶片株式会社 | Zoom lens and imaging device |
| CN109884779A (en) * | 2019-03-15 | 2019-06-14 | 广东奥普特科技股份有限公司 | A kind of low distortion camera lens |
| CN109884779B (en) * | 2019-03-15 | 2023-10-27 | 广东奥普特科技股份有限公司 | Low-distortion lens |
| CN114047616A (en) * | 2021-11-23 | 2022-02-15 | 中国航空工业集团公司洛阳电光设备研究所 | Medium wave infrared continuous zooming optical system with meter-level long focal length and hundred-fold variable power ratio |
| CN114047616B (en) * | 2021-11-23 | 2023-08-18 | 中国航空工业集团公司洛阳电光设备研究所 | Medium-wave infrared continuous zooming optical system with meter-level long focal length and hundred-fold zoom ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| US20150092280A1 (en) | 2015-04-02 |
| JP5711427B2 (en) | 2015-04-30 |
| WO2013187000A1 (en) | 2013-12-19 |
| JPWO2013187000A1 (en) | 2016-02-04 |
| CN104364695B (en) | 2016-08-24 |
| US9261684B2 (en) | 2016-02-16 |
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